service on a [_____] kV system with a short-circuit capacity of not less
than [_____] [amperes symmetrical][MVA]. Rating shall be based on IEEE
C37.04 and NEMA C37.06. Circuit breaker shall be drawout-mounted with
position indicator, operation counter, auxiliary switches, and primary and
secondary disconnect devices. Circuit breaker shall be operated by an
electrically charged, mechanically and electrically trip-free,
stored-energy operating mechanism. Provide for manual charging of the
mechanism. Circuit breaker control voltage shall be [[_____] Vdc][[_____]
Vac].[ SF6 circuit breakers shall be shipped factory filled with SF6 gas
conforming to ASTM D 2472.]
a.
Contacts: Silver-plated, multifinger, positive pressure, self-aligning
type for main drawout contacts.
b.
Each drawout breaker shall be provided with three-position operation.
The connected position and the test/disconnect position shall be
clearly identified by an indicator on the circuit breaker front panel.
1.
Connected position: Contacts are fully engaged. Breaker shall be
tripped before it can be racked into or out of this position.
2.
Test/disconnect position: Position shall allow for complete
testing and operation of the breaker without energizing the
primary circuit.
3.
Withdrawn (removed) positions: Places breaker completely out of
compartment, ready for removal.
][2.2.1.3
Load Interrupter Switch as Main Protective Device
IEEE C37.20.3. Provide a three-pole, single-throw, deadfront,
metal-enclosed, load interrupter switch with manual stored energy operator.
Switch shall be [fused, with fuses mounted on a single frame][non-fused][in
series with [vacuum][ or ][SF6] interrupters] and designed for easy
inspection[ and fuse replacement].[ SF6 gas shall conform to ASTM D 2472.]
The switch shall be operated by a manually charged spring stored energy
mechanism which shall simultaneously disconnect or connect ungrounded
conductors. The moveable blade of the switch shall be deenergized when in
the open position. The mechanism shall enable the switch to close against
a fault equal to the momentary rating of the switch without affecting its
continuous current carrying or load interrupting ability. A ground bus
shall extend the width of the switch enclosure and shall be bolted directly
thereto. Connect frame of unit to ground bus. The door shall have an
inspection window to allow full view of the position of the three switch
blades through the closed door. Switch ratings shall be:
a.
[_____] kV, [_____] kV BIL for service on a [_____] kV system with a
fault close rating of not less than [_____] amperes asymmetrical.
b.
The switch shall be capable of carrying continuously or interrupting
[_____] amperes with a momentary rating of [_____] amperes at [_____]
kV.
c.
Switch shall have provision for padlocking in the open and closed
positions.
d.
[Fuses shall be current limiting type rated [[_____] amperes
continuous, and [_____] [amperes interrupting capacity.]][approximately
[_____] percent of the transformer full-load rating and in accordance
SECTION 16361N
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